Subject-verb agreement question? One of the only...

Mrs. Smith is one of the only teachers who offers no homework.

Or should it be offer?

1 Answer

It should be offers.

Explanation:

The rules for a singular subject (a person) and regular verbs are typically a -s ending. If you were talking about the teachers as a group, it would be offer. However, you are talking about one teacher specifically as the subject, which then makes it 'offers':
"Mrs. Smith is one who offers no homework."
The pronoun "who" takes the place of the singular noun "one" as the subject of the relative clause, making the subject pronoun "who" a singular subject.